\"\"

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The proportion is \"\".

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Apply cross product property: If \"\", then ad = bc.

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\"\"           (Cross products)

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Apply distributive property: \"\".

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\"\"

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\"\"      (Multiply: \"\")

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\"\"                  (Multiply: \"\") \"\"

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Apply subtraction property of equality: Subtract 70 from each side

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\"\"

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\"\"                  (Apply additive inverse property: \"\")

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\"\"                          (Subtract: \"\")\"\"

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\"\"      (Subtract 90v from each side)

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Apply commutative property of addition: a + b = b + a.

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\"\"

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\"\"                       (Apply additive inverse property: \"\")

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\"\"                              (Subtract: \"\")\"\"

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Apply division property of equality: Divide each side by negative 50.

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\"\"

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\"\"                                   (Cancel common terms)

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\"\"                                        (Divide: \"\")\"\"

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The value of \"\".